Rotary engine



P. G. ACCHI ROTARY ENGINE June 7,1932.

Filed Oct. 19, 1931 Patented June 7, 1932 UNITED STATES PATENT OFFICE PERCY GEORGE TACCI-II, OF BRACKLESHAM, NEAR CHICI-IESTER, ENGLAND, A SSIGNOR OF ONE-HALF TO ERNEST MAYER-NEVILLE, OF LONDON, ENGLAND i ROTARY. ENGINE I Application filed October 19, 1931, Serial No. 569,752, and in Great Britain October 20, 1930.

This invention relates to rotary engines sleeve 14 which is also rotatable and which "of the kind in which the rotors are provided with continuously intcrmeshing teeth and a propulsive medium is supplied in succession to the spaces enclosed between adjacent teeth on the respective rotors, that is to say, the

propulsive medium is first supplied to a space between adjacent teeth on the rotors and then to the space between the next succeeding teeth on the rotors from a conduit coaxial with one of the rotors.

The invention consists in a rotary engine of the kind referred to having passages or I ports formed in one of the rotors through which passages the working medium is supplied from the coaxial conduit to the spaces enclosed between adjacent teeth on the respective rotors.

Further features of the invention will be apparent from the description given hereafter with reference to the accompanying drawing which illustrates by way of example one convenient form of apparatus in acr cordance with the invention and in which Figure 1 is an end view of the engine partly in section;

Figure 2 is a side View of Figure 1 partly in section; V Figure 3 is a detail of Figure 1;

exhaust duct.

Referring to Figures 1 and 2, the casing 1 is made in two halves secured together by bolts 1a or the like and is provided with a cover 3. Two rotors 4, 5 are mounted in the casing in such a manner that their teeth 6, 7 which, in the example shown,v are of cycloidal form, engage with one another. The rotor 4 is suitably secured to the driving shaft 8 which is supported in suitable bearings 9, 10 in the casing and cover. The rotor 5 is mounted so as to rotate freely about a sleeve 11 which is also freely mounted in H suitable bearings 11a in the casing and cover. It is to be noted that there is only one driving shaft from which the power is taken and that the rotor 5 rotates idly about its axis. A reduced portion 12 of the sleeve 11 is extended through the cover and is provided with a control handle 13.

Figure 4 shows an alternative form of the u l/Vithin the sleeve 11 is mounted a second is provided with a solid-extension 15 passing through the portion-12 and provided with a control handle 16. Steam is admitted :to the inner sleeve 14 and passes through an pansion escapes through the exhaust 24 to v any suitable condenser or to the atmosphere as desired. An exhaust port 24 is provided on the, opposite side for use when rotating in the opposite direction to the arrow in Figure 1.

The steam distributing rotor 5 is kept in 1 good steam-tight contact with the sleeve 11 by virtue of the reaction of the pressure and with the teeth of the rotor 4 by the resistance to the movement of the shaft 8.

By movement of the handles 13 and 16 the two sleeves can be moved to various positions relative to one another so as to control the speed, the point of admission, the point of cut-off, the direction of rotation and the duration of the admission of working fluid to the respective fluid passages in the rotor 5.

In Figure 3 the control is shown in the full open position for operating the engine in one direction.

An alternative form of exhaust is shown in Figure 4 in which the passages 30, 31 are led around the casing and unite in a common duct 32 which may be connected to a condenser or to the atmosphere as desired. This duct is preferably controlled by a valve 33 provided with a port 34 which, on proper adjustment, puts either one or other of the passages 30, 31 in communication with the duct 32 while at the same time preventing all communication of these two passages with one another.

In applying the invention to internal combustion engines, air may be admitted to the spaces between the vanes of the rotors and the explosive mixture supplied through the sleeves -11 and 14:, the ports 17 18 and the I If desired the fuel radial passages 20, 21. may be injected midway between the axes of.

thetwo. rotors and the air of combustion through the radial passages in the rotors or vice versa'. Ignition and expansion Wlll take place in sequence in the spaces formed by the I teeth of the rotors, the ignition being efi'ec't'ed by the heat of compression or by any other suitablemeans. Further, cross flash channels may be provided as described in the specification of British Patent No. 124,284:

(P. G. Tacchi), if desired. Suitable cooling means such as ducts for the passage of water may be employed around the engine.

Having now described my invention, what I claimas new and desire to secure by Letters Patent is 1. A rotary engine, comprising rotors having teeth engaging with one another, a casing enclosing said rotors, a conduit for working medium disposed coaxially of one of said rotors, said rotor having passages therein for supplying working medium from the conduit to the spaces enclosed between adjacent teeth on the respective rotors.

2; A rotary engine as claimed in claim 1, wherein said passages extend some through the teeth of said rotor and others through the portions of the rotor between the adjacent teeth thereon.

3. rotary engine comprising rotors having teeth engaging with one another, a casing enclosing said rotors, concentric hollow shafts having ports therein and constituting a conduit for working medium, said Ishaijts rotatably supporting one of said rotors and 1 said rotorhaving passages therein for supplying working medium from the conduit to the spaces enclosed between adjacent "teeth on the respective rotors.

In testimony whereof I have vsigned vmy name to this specification. 'PERGY GEORGE *TAQGH-L 

